20504677 has 2 divisors, whose sum is σ = 20504678. Its totient is φ = 20504676.

The previous prime is 20504647. The next prime is 20504681. The reversal of 20504677 is 77640502.

20504677 is nontrivially palindromic in base 5.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 1153476 = 4399^2 + 1074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20504677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20504647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252338 + 10252339.

It is an arithmetic number, because the mean of its divisors is an integer number (10252339).

Almost surely, 2^20504677 is an apocalyptic number.

It is an amenable number.

20504677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504677 is an equidigital number, since it uses as much as digits as its factorization.

20504677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 20504677 is about 4528.2090278608. The cubic root of 20504677 is about 273.7059955817.

The spelling of 20504677 in words is "twenty million, five hundred four thousand, six hundred seventy-seven".